Shaking and dumping grate.



No. 852,467] PATEN TED MAY 7, 1907. E. E. & H. L. STROTHMAN. SHAKING AND DUMPING GRATE.

- APPLICATION FIL-ED 00110, 1905.

JNVENTORS 80: J a. 6; h m. 1J2 x. 4??

ATTORNEY.

1n: norams PETERS cm, wAsmncwN,

TINTTED STATES PATENT DFFTCEO EDWARD E. STROTI-IMAN AND HERBERT L. STROTHMAN, OF SUPERIOR, WISCONSIN.

SHAKING AND DUMPING GRATE.

Specification of Letters Patent.

Patented May '7, 1907.

Application filed October 10, 1905. Serial No. 282,138.

To aZZ whom it may concern:

Be it known that we, EDWARD E. STROTH- MAN and HERBERT L. STROTHMAN, citizens of the United States, residing at Superior, in the county of Douglas and State of Wisconsin, have invented certain new and useful Improvements in Shaking and Dumping Grates;

and we do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

- Our invention relates to shaking and dumping grates for furnaces and has for its object the provision of a grate-bar provided with an adjustable trunnion.

It has for a further object the provision of a rocking shield mounted on the side bar of a shaking or dumping grate and adapted to be engaged and operated by the grate bar.

It has for a further object the provision of a shield adapted to overlie the trunnion bearing on said side bar and to protect the samefrom excessive heat and to form a fire bearing surface and containing draft passages.

With these and other objects in view, it consists of the constructions, combinations, and arrangements of parts hereinafter described and claimed.

In the accompanying drawings, Figure l is a perspective view, partly broken away, of our improved gratebar. Fig. 2, is a central longitudinal vertical section through the adjoining ends of the grate bars of a double grate, showing the central or common supporting bar in cross section. Fig. 3, is a side elevation of a portion of the side bar of said grate, showing one form of our improved rockingshield in normal position and also in rocking 0r dumping position. Fig. 4, is a de tail perspective view of said shield. Fig. 5, is a side elevation of a portion of a modified form of said side bar, and of a modified form of my improved shield in normal position and also in rocking or dumping position.

.Fig. 6 is an enlarged detail perspective view to the central bar may, if desired, be used as a side bar, but if the side bar have one flush side face it would not be as desirable for use as the central bar of a double grate. Said side and central supporting bars are transversely apertured or recessed at intervals, as at 1 for the reception of the trunnions of the adjoining grate bars, and said apertures, instead of being slots open at the upper edge of the bar, are preferably circular, in which case the supporting bars will hold the grate bars down and prevent them from jumping out of engagement with the supporting bars. Concentric bosses 1 are preferably formed around said recesses or apertures in the supporting bars to afford broader bearings for the trunnions of the grate bars, and in the form of said invention shown in Fig. 3, said bosses form fulcrums for corresponding shields 5. In the modified form of said invention shown in Fig. 5, lugs are preferably formed on one face or the other of the supporting bar at the position 1 to operate as pivots for the corresponding modified shields; but it is obvious that said modified supporting bars may be apertured at 1 instead of being provided with such lugs, and that equivalent lugs may be formed on the shields to engage such apertures; or separate pivots may be projected through the modified shields and through said modified bars at the points 1 to form supports for the fulcrums of such shields, these various forms of attaching said modified shields to the modified supporting bars being regarded as equivalents within the spirit and scope of my invention.

The grate bars 2 are longitudinally apertured at one end as at 2 to receive a sliding trunnion 3, which in operation is adapted to be partly projected into corresponding recesses or apertures 1 in the side or central supporting bars 1 or l Said trunnion may be secured in operative position by any suit able means, as by a push spring 4, or by a locking pin 3 extending from said trunnion through a downwardly opening transversely directed slot 2 formed in said grate bar at an angle to, and communicating with the trunnion passage 2 Said slot 2 communicates with an outwardly opening longitudinally directed slot 2 formed in the side of said bar and extending parallel to, and communicating with said passage 2. It will be obvione that when the trunnion is projected and the pin 3 is in the slot 2 said trunnion will be held in its projected position, but that when said pin is manually swung upwardly in said slot 2 and backwardly along the slot 2 it will recede said trunnion'and disengage it from the side or central supporting bar. Said sliding trunnion may be provided at each end of the grate bars, or, if desired one, end of each bar may be provided with a fixed trunnion as 3.

Mounted on the side or central supporting bars, or both, are rocking or dumping firebearing shields 5, or 6. Said shields comprise the body portion 5, preferably grated or provided with draft passages as at 5 and recessed or notched at each end as at 5 which notches are adapted to engage operating lugs 2 and 2 formed upon the ends of the adjoining grate bars. Said shields 5 are also provided on one or both sides with a lug or lugs 5 partly concentric with and adapted in operation to engage the boss or bosses 1 on one or both sides of the side or central supporting bar, said boss or bosses forming the point of resistance upon which said shield is fulcrumed. Thus, where the grate bar is rocked in the proper direction, one of the lugs, as 2, raises one end of the shield 5, which pivots upon the boss 1 and is held thereby in proper position. I/Vhen the grate bar is rocked back to normal position, the opposite lug 2 tips the shield 5 back to normal position. If desired either the. lug 2 or 2 may be omitted when using the shield 5, depending upon relative setting of the shield 5 to the grate 2, and the shield returned to normal position by gravity.

The shield shown in Figs-5, 6, and 7 is of somewhat different construction from that just described. It consists of the body portion 6, having legs 6 formed thereon at one end adapted to straddle the side or central supporting bar. A lip 6 is provided upon one side of said body portion near the opposite end thereof and a lug 6 is formed upon the opposite side of said body portion at said opposite end by which it is adapted to be pivoted to the side or central supporting bar, as by engagement with one of the lugs at 1. Said shield 6 is preferably grated, as at 6 to form draft passages, and bars 6 are preferably formed across the front of said le s to prevent the entry of clinkers between t em. One of the lugs, as 2 formed on the end of the adjoining grate bar is adapted to engage the free end of said shield 6 and, when said grate is rocked in the proper direction, to tilt said free end of the shield 6 upward, The shield 6 will usually fall to normal position by gravity when the grate bar is rocked back to normal position, but we prefer to form feet 6 upon said legs 6 which feet, or one of them may be engaged when necessary by the descending lug 2 to start or force the lifted end of the shield downward. The position of the lugs 1 and 2 may be varied, as may be suitable and desired, with regard to ra dial distance and direction from the longitudinal axis of the respective said grate bars, and the dimensions and proportions of all or any of the parts of our said invention may be varied, as may be suitable and desired, without departing from the spirit and scope of our said invention. As will be observed the shields preferably do not contact at all points along their under faces with the upper edge of the side or central bars, but space is left between the greater part of said under faces and said upper edge of the supporting bar, either by arching the shields as at X or by cutting away the edge of the supporting bar, as at Y, or both. Such spaces form air passages, and, to a degree, a means of escape for fine ash, aswell as serve to lighten the weight of the parts. If said grate bars are provided with slidable trunnions only at one end, such bars may, after the withdrawal of the slidable trunnions, be drawn endwise sufliciently to disengage the fixed trunnion from the opposite supporting bar. Said grate bars may be rocked or dumped by any suitable means, as but a connecting bar 7, engaging hooks 8 formed on said grate bars, and operated by a draw or push rod 9.

The operation of said invention will be clear from the foregoing description.

Having now described our invention, what we claim and desire to secure by Letters Patent is,

1. In a dumping grate, the combination of a grate bar having a recess formed in one of its ends, a slot extending upwardly through the lower edge of said bar and partly through said bar in a transverse direction, said bar having a slot formed through one of its sides communicating with said recess and with the first said slot, a sliding trunnion in said recess, and a pin engaging said trunnion and adapted to be operated to project or retract said trunnion and to extend through one or the other of said slots according to the position of said trunnion, and a push spring in said recess adapted to normally hold said trunnion in a projected position.

2. In a dumping grate, the combination of a grate bar having a recess formed in one of its ends, a slot communicating upwardly with said recess and opening downwardly through the lower edge of said bar and extending partly through said bar in a transverse direction, said bar having a slot formed through one of its sides communicating with.

said recess and with the first said slot, a sliding trunnion in said recess, and a pin engaging said trunnion and adapted to be operated to project or retract said trunnion and to extend through one or the other of said slots accordlng to the position of said trunnion.

3. In a dumping grate, the combination of a relatively stationary support, rocking shields mounted on said support, rocking grate bars mounted on said support independently of said shields and provided With means adapted to engage said shields to rock the same.

4. In a dumping grate, the combination of a relatively stationary support, rocking shields mounted on said support and ada ted to fulcrum thereon, rocking grate ars mounted on said support independently of said shields and having lugs formed on their ends adapted to engage said shields and rock the same.

5. In a' dumping grate, the combination of a relatively fixed support having a boss formed thereon, a shield mounted on said support and provided with a lug adapted to engage on said boss, and means for rocking said shield on its support.

6. In a shaking and dumping grate, the combination with a grate support, a grate bar having a trunnion engaging said support, a trunnion shield comprislng a body portion provided with a notch or recess in its side and provided on one side intermediate of its ends with a depending lug.

7. In a dumping grate, the combination with a suitable grate support of a rocking shield pivotally mounted thereon and comprising a body portion, legs depending from one end, a lug on one side at the opposite end, and a lug or lip upon the opposite side intermediate of the ends.

8. In a dumping grate, the combination with a suitable relatively stationary support, of a rocking shield pivotally mounted thereon and provided with depending legs at one end adapted to engage said support, a grate bar journaled on said support independently of said shield and adapted to engage said which said cover extends, and to there engage a projecting portion formed on said supporting bar; means for coupling a number of said grate bars together and adapted to rock the same on their bearings, and'means for operating said rocking means.

10. In a shaking and dumping grate, the combination of supporting bars; grate bars having trunnions ournaled in said supporting bars, said supporting bars each having lugs formed upon one of their side faces; trunnion covers for said trunnions, each comprising a grated trunnion covering portion, and depending portions adapted to straddle one of said supporting bars, the free end of one of said depending portions being adapted to extend under one of said lugs; and means for rocking said grate bars.

In testimony whereof we hereunto aifix our signatures, in presence of two witnesses.

EDWARD E STROTHMAN. HERBERT L. STROTI-IMAN.

Witnesses:

A. J. WENTZEL, W. L. BEARDSLEY. 

